On this page we can find the extensions Facemesh.aix (face) and Posenet.aix (body):
https://mit-cml.github.io/extensions/
(Example Posenet: http://appinventor.mit.edu/explore/resources/ai/aiDance).
Example Facemesh in this Community:
@ewpatton, I think another extension for "hand tracking" would be interesting...
Video: Hand tracking.
Regards.